Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Poster Session: Correlated Electrons 1
TT 17.31: Poster
Montag, 1. April 2019, 15:00–18:30, Poster D
Magnetic anisotropy of the van der Waals ferromagnet Cr2Ge2Te6. — •Alexey Alfonsov1, Julian Zeisner1,2, Sebastian Selter1,2, Saicharan Aswartham1, Bernd Büchner1,2, and Vladislav Kataev1 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany — 2Institute for Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany
Cr2Ge2Te6 compound is a quasi-two-dimensional semiconducting magnet belonging to the family of ferromagnetic layered transition metal trichalcogenides. Ferromagnetic order surviving even in the monolayer samples of these compounds renders these materials attractive for the fundamental research and for future technological applications. Such violation of Mermin-Wagner theorem is possible due to magnetic anisotropy present in these materials. Here we report an experimental study of the magnetic anisotropy in bulk single crystals of Cr2Ge2Te6 by means of electron spin resonance (ESR) and ferromagnetic resonance (FMR) using conventional and torque-detected ESR spectrometers. Measurements were carried out in a wide frequency and temperature range, and at various angles between magnetic field and sample plane. Angular and frequency dependent measurements in the ferromagnetic phase clearly show the easy-axis type anisotropy of Cr2Ge2Te6. Furthermore, simulation of the measured data based on a phenomenological approach yielded a precise value for the magnetocrystalline anisotropy energy density.